【题目】How does the man tell the time?

【题目】Though plastic bags really bring convenience to us，they also ________ many problems for the environment.

【题目】The greatest discovery of our generation is _____ a human being can change his life by changing his attitudes.

【题目】I ________ my dream to be a pianist, but for the encouragement from that music teacher.

【题目】Their optimism and willingness to communicate are two characteristics that ________ for their lack of experience.

【题目】_____ their inexperience, they’ve done a good job.

【题目】I wasn’t blaming anyone；I ________ said errors like this could be avoided.

【题目】The inventor is satisfied to see a number of new products _____ after countless efforts.

【题目】Tourists who enter the quiet area _____ obey the rule to reduce any potential effect on the environment.

【题目】It may rain，but I shall go out ________.